Word Problem 3

[ocgirl83]

David gets to work in 20 min when he drives his car. Riding his bike(by the same route) takes him 45 mins. His average driving speed is 4.5 mph greater than his average speed on his bike. How far does he travel to work?

 

[stapel]

biking:
rate: b
time: 3/4
distance: ???

driving:
rate: b + ???
time: 1/3
distance: ???

Complete the table. Set the equal distances equal. Solve.

Eliz.